'93 N/A E4OD. Bought the truck and thought the trans valve body needed rebuilt and speedo didn't work. New vss really improved trans but hard 1-2 shift and bump in and out of OD over 65mph. Also speedo erratic over 50mph. 2nd vss same problem. Week later tach guage at 0 until engine warm up, only on really cold mornings. Another week tach at 0 permanently and trans in limp. Replaced tach sensor same problem. Anyone with fresh ideas appreciated, thanks
E4OD electric gremlins
- Thread starter okie
- Start date
gnathv
Full Access Member
If trans is in limp mode you should be able to pull codes to find problem.
gnathv
Full Access Member
Does your cigarette lighter work?
Minuteman96
Registered User
What could this mean? Mine went out after fixing a blown fuze that was preventing the computer from getting power which meant no electric power to pretty much everything else.
gnathv
Full Access Member
Sorry wrong year, 94 cigarette lighter and obd power port are same fuse. Doesn’t apply to 93.
1 checked all fuses early on
2 no check engine light ever, may be burned out
3 ran and drove nice for few months except for bouncing speedo and occasional OD off flash
4 then one day tach stayed at 0 and trans was in limp, permanent OD off
5 Pulled gauge cluster and the circuit paper looked awful, tiny spots of rust all over under side; didn't take cluster apart to see condition of boards. Plugged it back and speedo and gas gauge didn't work for a while then came back but speedo still erratic
2 no check engine light ever, may be burned out
3 ran and drove nice for few months except for bouncing speedo and occasional OD off flash
4 then one day tach stayed at 0 and trans was in limp, permanent OD off
5 Pulled gauge cluster and the circuit paper looked awful, tiny spots of rust all over under side; didn't take cluster apart to see condition of boards. Plugged it back and speedo and gas gauge didn't work for a while then came back but speedo still erratic
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gnathv
Full Access Member
Is your overdrive light flashing?
was thinking it was the gauge cluster; probably speed issue for a long time and now tach gauge finally went too. It looks bad enough on back it could be issue and lot of guys on here fixed same trans issues with psom replacement. But I also can't get codes out of tcu/ecu/pcu/ecc whatever you want to call it
gnathv
Full Access Member
I’d start by trying to get tach working and see if that leads you to the problem.
For your transmission to work you need signals from the VSS, Tach, and FIPL.
For your transmission to work you need signals from the VSS, Tach, and FIPL.
gnathv
Full Access Member
Follow your tach or VSS signal and see where it stops, could be dash, that’s where they intersect.
gnathv
Full Access Member
Have you pulled out instrument cluster and cleaned all connections and grounds?
gnathv
Full Access Member
Being your not able to read codes, have you checked your TECA relay? This powers the TECA (Transmission Electronic Control Assembly) module.
Pin 1 has voltage all the time. When you turn key to start or run Pins 37, 40, 57, and 60 are powered also. It may be worth checking.
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Pin 1 has voltage all the time. When you turn key to start or run Pins 37, 40, 57, and 60 are powered also. It may be worth checking.
